I am very happy with my Sony 505.
I have not yet purchased anything from the Sony ebookstore,
although I have downloaded some of their freebies.
I have found plenty of free reading material from a variety
of sources to keep me content. The categories include sci-fi,
fantasy, romance, spiritual, etc.
I joined two public libraries (NY & DC) from:
https://wiki.mobileread.com/wiki/EBook_Lending_Libraries
I created wishlists on my accounts so I can easily access
something I'm interested in reading.
For "me", the 505 suits me well.
I'm pleased as punch with it! : )
When looking at ereaders, you need to look at the big
picture (device features, quirks, company, bookstores, freebies, etc)
then narrow it down to which device will give you the most satisfaction.